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- "Aftermarket weapon customization; updated firing mechanism converts the NSG 23 burst fire mode from three rounds to five rounds."
- ―W-Y SR4 Burst Fire Modification description (from Aliens: Colonial Marines - Arsenal Upgrades - W-Y NSG 23 Assault Rifle - W-Y SR4 Burst Fire Modification)
The SR4 Burst Fire Modification
is a firing mechanism manufactured by the Weyland-Yutani Corporation
for the NSG 23 Assault Rifle